1 / 26

Challenges to Stored Product Organophosphates: Transition and Mitigation Strategies

This article discusses the challenges and transition strategies faced by stored-product organophosphates in light of new risk mitigation measures. It provides an overview of the current issues and the status of various organophosphate compounds, including Chlorpyrifos-methyl, Pirimiphos-methyl, and Dichlorvos. The article also highlights the negotiations, proposals, and voluntary cancellation agreements made with the EPA and the potential future outcomes. Contacts for further information are provided at the end of the article.

buckleye
Download Presentation

Challenges to Stored Product Organophosphates: Transition and Mitigation Strategies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Organophosphate Transition: Challenges to Stored Products Frank Arthur Ted Rogers USDA-ARS-GMPRC USDA-OPMP Manhattan, KS Wash. DC

  2. Background Information • In 1998 EPA proposed new risk mitigation strategies for phosphine • USDA-OPMP established the USDA phosphine task force • Industry coalitions were also formed

  3. Background Information • These various groups interacted with EPA • Agreements reached on new risk mitigation measures • Process led to increased interest regarding stored product pest management

  4. Problems in Post-Harvest • Already limited registrations of insecticides that can be used in various arenas • Existing products are facing increased scrutiny • Few options for new registrations

  5. Current Issue: FQPA • 1996 Food Quality Protection act • Targets organophosphates with common modes of action (carbamates too) • Some applications of minor-use products may be sacrificed to retain primary markets

  6. Review Status of Stored-Product OPs • Chlorpyrifos-methyl (Reldan) • Pirimiphos-methyl (Actellic) • Dichlorvos (Vapona, DDVP)

  7. Chlorpyrifos-methyl (Reldan) • Time lines • Status • Current philosophy and approach: “It’s not over until its over”

  8. Initial Stage • 12/99 Public comment period completed • 4/12/00 Conference call with users, registrants, scientists, EPA • 4/14/00 Dow AgroSciences issues voluntary cancellation letter to EPA

  9. Second Stage • 4/28/00 Release of revised risks • 6/01/00 Initiation of 60-day public comment • 8/16/00 Dow and EPA begin negotiations on Reldan phase-out

  10. Negotiations for Phase-Out • EPA recommends 2 years continued use, 1 yr for depletion of existing stocks • 12/20/00 Conference Call with various parties • Further negotiations and rebuttals

  11. Proposal for Final Agreement • Sale of Reldan ceases on 12/31/03 • Final cancellation on 12/31/04 • The Reldan dust formulation will be off the market in the next several months • 1/30/01 Voluntary cancellation agreement

  12. Reldan Transition Strategy • 3/29/01 First meeting in Kansas City • Discussion with EPA, scientists, user groups, registrants • 5/25/01 Meeting with USDA-OPMP, registrants, and EPA (part of ongoing process)

  13. Primary Discussion Topics • Possible extension of chlorpyrifos-methyl registration in Storicide (cyfluthrin + CM) • Extension may be contingent on a viable replacement product registered by 12/31/04 • Storicide is now used on wheat in S. Dakota under Section 18, Section 3 label pending

  14. Future Outcome? • Interim risk management decision (IRED) issued, withdrawn temporarily for corrections • As of now, the 01/31/01 voluntary agreement stands • Conversations continue, other stakeholder meetings may be forthcoming

  15. Pirimiphos-methyl (Actellic) • Time lines and status • Process of deliberations • Seemingly fewer problems than with chlorpyrifos-methyl

  16. Initial Stage • 3/99 Public comment on preliminary risks • 2/01/00 USDA and Land-grant University comments to EPA • 2/15/00 USDA and Willfarm (registrant) meet with EPA, Willfarm to do additional tox work

  17. Second Stage • 3/29/00 Revised risk assessments released • 4/20/00 USDA-OPMP sends out information regarding assessment and comments • 5/31/00 Public comment period completed • 6/00 Willfarm merges to become Agriliance

  18. Final Stage • 8/00 Interim Reregistration Eligibility Decision (IRED) date moved to fiscal 01 • 1/11/01 IRED conference call • 1/19/01 USDA expresses concern regarding EPA requirements for closed system for mixing and loading for on-farm applications

  19. Conclusion • 2/08/01 USDA meets with EPA to discuss an inexpensive closed system for mixing • 4/11/01 USDA arranges for demonstration • EPA has stated that the system will be acceptable, IRED signed but not published

  20. Dichlorvos (Vapona, DDVP) • Time lines and status • Used primarily in food warehouses, with the exception of stored peanuts in SE USA • Chemical has been under discussion for 12-15 years

  21. First stage • 11/17/00 USDA-OPMP conference call • 12/00 Public comment on preliminary risk assessments completed • 1/31/01 Informal DDVP stakeholders group created

  22. Second Stage • AMVAC (technical and primary registrant) meets with EPA to discuss CalEPA approach for pest strips only • Suggestions include retention of pest strip uses in residential unoccupied spaces and commercial applications • 4/24/24 USDA Stakeholder conference call

  23. Current Stage • 5/17/2001 USDA Stakeholder meeting with EPA • Issues discussed include role of DDVP in IPM programs, resistance management, food protection, and minor uses • Technical briefing possible for October, triggers comment, IRED not until FY2002

  24. Final Comments • USDA-OPMP actively working with stakeholders and user groups • Continued dialogue with EPA • Need participation from users, trade associations, commodity groups, and pest management professionals to help with process

  25. Contacts • Ted Rogers, USDA-OPMP • http://www.ars.usda.gov/opmp • TROGERS@ars.usda.gov, (202) 720-3846 • Contact Ted to get e-mail distribution list for insecticides and other stored product issues

  26. More Contacts and Resources • Frank Arthur, USDA-ARS • http://bru.gmprc.ksu.edu/arthur • arthur@gmprc.ksu.edu, (785) 776-2783 • Web site for Biological Research Unit is bru.gmprc.ksu.edu

More Related